MECHANICAL CHARACTERISTICS OF DOMES
OF LARGE SURGE TANK AT TAILRACE DURING CONSTRUCTION
WANG Kezhong1,YIN Honglei2,LI Zhongkui3,MAN Zhiwei1
(1. School of Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou,Zhejiang 310014,China;2. BGI Engineering Consultants Ltd.,Beijing 100038,China;3. State Key Laboratory of Hydrosciences and Engineering,
Tsinghua University,Beijing 100084,China)
Abstract:The surge tank at tailrace of Jinping I hydropower station is composed of two vertical cylindrical wells of large-diameter at the location of high stress and complex geological configurations with two large scale faults and multiple sets of joints. It was difficult to cavern out the domes and setup supporting structures at the top of cylindrical wells. Engineering practice and theoretical research show that the methods of excavation and the parameters of supporting are the key factors influencing the stress distribution and deformation at the crest of the dome of the tailrace surge tank. Lamprophyre veins and fault f14 were found to exist above the dome of tailrace surge tank #1 through in-situ investigations. The deformation and failure mechanisms of surrounding rock of the tailrace surge tank are studied through mechanical analysis,in-situ monitoring and 3D numerical simulation. The deformational and mechanical characteristics of the dome rocks during excavation process were studied. Some advices on the excavation and support for the tailrace surge tank are thus presented as the technical supports for its excavation and design of the support.
王克忠1,尹宏磊2,李仲奎3,满志伟1. 大型尾水调压室穹顶开挖支护力学与变形特征研究[J]. 岩石力学与工程学报, 2014, 33(7): 1398-1406.
WANG Kezhong1,YIN Honglei2,LI Zhongkui3,MAN Zhiwei1. MECHANICAL CHARACTERISTICS OF DOMES
OF LARGE SURGE TANK AT TAILRACE DURING CONSTRUCTION. , 2014, 33(7): 1398-1406.
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